Correcting colour casts in slides
I'm converting my old slide films to digital. Some of them are 45 years old, and have strong colour casts. For instance old Agfachome has a heavy magenta cast. I can correct these individually using the dropper on a grey subject, but it's not always possible to find a neutral grey on every photo.
So I'd like to create a preset to uniformly remove the colour cast from each slide in a film. Is this possible?
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Sure, after making just the color correction on one of your slides, make a new Preset using the Settings > Save Settings as Preset… command so that is all it contains then apply it as your first step to new scans.
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Thanks Brian, but I tried just that, and wasn't convinced that it'd do the job. Setting the colour correction on slide 1 appears to just set a particular colour temperature and tint. The preset generated from that does the same for all other slides, ie sets the same colour temperature and tint. If slide 1 is taken in bright daylight, and the second inside, surely this is wrong?
I also looked at effects / photo filter to reduce the magenta, but then I had the problem of choosing which shade of magenta I needed. Is there a way of determining what the colour cast is at a particular point? This way seems more appropriate for the problem.
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That's the way they work, sorry. They are not adaptive; i.e.; taking a new temperature reading for each picture. If you're having trouble finding neutral grays to use so would the program.
Make a different preset for each lighting situation, kind of like the White Balance settings we already have.
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What software are you using to do the scanning? VueScan is very cheap and works even with scanners whose drivers have been discontinued for years. I use it with my Nikon Coolscan 4000 on an Apple Silicon system! It can do the color correction when the scan is made. It is very powerful. It replaced SilverFast on my system.
It is Mac only though. https://www.hamrick.com/
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I'm using a macro lens with slide adapter. I had previously used an Epson V800, but found it painfully slow, with 5,000 slides to convert :0)
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Then your color corrections are going to have to be done manually. How are they being illuminated? Is the light source constant? That introduces another variable into the system that will affect the color cast.
With that many slides you might want to consider culling them then having them scanned professionally. (And quickly. 😉)
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